DatumNest: Tolerance Stack

About DatumNest: Tolerance Stack

DatumNest is a mechanical tolerance-stack laboratory for product engineers, machinists, quality teams, manufacturing students, and design-review conversations.

Build a signed one-dimensional chain with explicit nominal values, bilateral tolerances, sensitivity coefficients, notes, and distribution assumptions. DatumNest calculates nominal closure, worst-case range, RSS standard deviation, variance contribution, and a deterministic 12,000-run Monte Carlo yield screen against entered limits.

KEY FEATURES
- Signed dimension-chain workspace
- Worst-case min and max closure
- RSS standard-deviation estimate
- Rectangular, triangular, and normal ±3σ assumptions
- Variance contribution ranking
- Seeded 12,000-run Monte Carlo distribution
- Editable specification limits
- Local engineering PDF report
- 300 original offline technical plates
- No account, ads, analytics, tracking, IAP, or subscription

DatumNest is an engineering screening and communication tool. Confirm datum schemes, geometric effects, correlations, distribution assumptions, process capability, units, and acceptance criteria with qualified design and quality personnel.